Dažādu laktāciju govju piena produktivitātes izmaiņas laktācijas sākuma fāzē

Petrovska, S., Latvia Univ. of Agriculture, Jelgava . Faculty of Agriculture. Inst. of Agrobiotechnology; Jonkus, D., Latvia Univ. of Agriculture, Jelgava . Faculty of Agriculture. Inst. of Agrobiotechnology

Dažādu laktāciju govju piena produktivitātes izmaiņas laktācijas sākuma fāzē | Milk productivity changes of different lactation dairy cows in early lactation stage

2014

Petrovska, S., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology | Jonkus, D., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology

Lactation is a factor affecting milk productivity. Recording data was analyzed from 22 first-, 17 second- and 26 third- and older lactation dairy cows. Cows were from different breeds. Data was collected from calving to the 3rd milk recording (average 80th day of lactation). All cows were kept in loose housing system and fed with total mixed ration. Significantly highest milk yield was in 3rd lactation group in 2nd recording (45.4 ± 1.48 kg, p is less than 0.05). Fat content was significantly different in 1st and 3rd lactation groups in 1st and 2nd recordings, highest fat content was in 3rd lactation group in 1st recording (4.79 ± 0.14%; p 0.05). Milk protein, lactose content and SCS did not differ significantly. Fat – lactose ratio was highest in 3rd lactation group in all recordings. Highest fat – lactose ratio was in 3rd lactation group in 1st recording (0.98).

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Mots clés AGROVOC

dairy cows data analysis data collection data processing dispersion statistique grasa de la leche lactation lactosa lactose latvia letonia lettonie milk fat milk protein milk yield procesamiento de datos rendement laitier rendimiento lechero research methods statistical dispersion vacas lecheras

Informations bibliographiques

Editeur

Latvijas Lauksaimniecības universitāte

Pagination

p. 40-43

D'autres materias

Traitement des donnees; Analisis de datos; Proteine du lait; Analyse de donnees; Coleccion de datos; Proteinas de la leche; Collecte de donnees; Dispersion estadistica; Vache laitiere; Matiere grasse du lait; Lactacion

Langue

letton

ISBN

978-9984-48-158-6

Type

Conference; Summary; Am

Conférence

Zinātniskais seminārs: Ražas svētki „Vecauce – 2014”. Lauksaimniecības zinātne jaunajā plānošanas periodā, , Vecauce (Latvia), 6 Nov 2014

Sur AGRIS depuis: 2014-01-15

Format: AGRIS AP

Fournisseur de données

Cette notice bibliographique a été fournie par Fundamental Library of Latvia University of Life Sciences and Technologies